Cisco Cisco Packet Data Gateway (PDG)

 

▄  VPC-VSM System Administration Guide, StarOS Release 19 

Virtual LANs (VLANs) provide greater flexibility in the configuration and use of contexts and services. 

They are configured as “tags” on a per-port basis and allow more complex configurations to be implemented. The 
VLAN tag allows a single physical port to be bound to multiple logical interfaces that can be configured in different 
contexts. Therefore, each Ethernet port can be viewed as containing many logical ports when VLAN tags are employed. 

VLANs can be created at the hypervisor and StarOS levels. Where you create the VLAN depends on your specific 
network requirements. 

Depending on the type of packets being processed over the network, the hypervisor performs different VLAN tasks 
prior to exchanging packets with the StarOS virtual machine (VM). 

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Management packets – MGMT packets arrive untagged and the hypervisor exchanges these packets with the 

VM without additional VLAN processing. 

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Access packets – arrive from the physical network with VLAN tags. The hypervisor removes the VLAN tags 

before forwarding them to the VM. It re tags the packets received from the VM prior to sending them across 
the physical network. 

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Trunking – packets arrive and depart across the physical network with VLAN tags. The hypervisor filters the 

tags before sending tagged packets to the VM for additional processing. 

Management, access and trunking packets should be defined in separate contexts and bound to unique interfaces. The 
hypervisor should be configured to provide the appropriate type of VLAN tagging or filtering based on the packet type.